Total: 172 data, Page 18 of 18
|2. [Evolutionary Nanomaterials & Nanodevices] Chang Woo Park, Youn Bong Park, Jin Woo Cheon, and Sung Rack Choi, and Moo-Jin Jun*
Dichloro, Alanine and S-Methylcysteine Cobalt (III) Complexes of Ethylenediamine-N,N ′ -di- α -isobutyric Acid
Bull. Korean Chem. Soc., 11(4), 354-357 (Aug 20, 1990) DOI : https://doi.org/10.5012/bkcs.19126.96.36.1994
Synthesis of dichloro cobalt (Ⅲ) complexes of a flexible N2O2-type tetradentate ligand, ethylenediamene-N, N'-di- -isobutyric acid (eddib), has yielded two geometrical isomers, s-cis-(Co (eddib) Cl2)-and uns-cis-(Co (eddib) Cl2)-. A series of substitution reactions, (Co (eddib) Cl2)- →(CO (eddib) Cl H2O)→(Co (eddib) CO_3)-→(Co (eddib (H2O)2)+ have been run for each of the two geometrical isomers. The reaction between the s-cis-(Co (eddib) Cl2)- complex and L-alanine (L-als) or S-methyl-L-cysteine (L-mcy) gave the meridional s-cis-[Co (eddib)(aa))(aa= L-ala or L-mcy) complex. The S-methyl-L-cysteine was found to coordinate to cobalt (Ⅲ) ion via the nitrogen and oxygen donor atoms.
|1. [Evolutionary Nanomaterials & Nanodevices] Jin Woo Cheon, Sung Sil Lee, Sung Rack Choi, and Moo-Jin Jun*
Cobalt(III) Complexes of Ethylenediamine-N,N′-di-S-Isobutylacetic Acid
Polyhedron, 8(24), 2889-2891 (May 31, 1989) DOI : https://doi.org/10.1016/S0277-5387(00)86285-3
A new optically active ONNO-type tetradentate ligand, ethylenediamine-N,N′- di-S-isobutylacetate (SS-eniba), has been synthesized. During the preparation of diaqua cobalt(III) complexes of SS-eniba, [Co(SS-eniba)(H2O)2]+, the title ligand has coordinated stereospecifically to the cobalt(III) ion to give three isomers, Δ-s-cis, Δ-uns-cis and Λ-uns-cis, which have been isolated and characterized via electronic absorption, circular dichroism (CD), and 1H NMR spectroscopy, along with elemental analysis data. The preparation of Δ-s-cis-[Co(SS-eniba)Cl2]+ and Δ-s-cis-[Co(SS-eniba)CO3]+ are also reported.